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Chapter 6 Filter 79
EVOC 20 TO
The EVOC 20 TO is a vocoder equipped with a monophonic pitch tracking oscillator,
hence the TO in its name (more information about vocoders can be found in the
chapter “Vocoder—Basics” on page 167). Non-technically, this allows the EVOC 20 TO to
follow (track) the pitch of a monophonic incoming audio signal. If the audio signal is a
vocal melody, for example, the individual pitches of the sung notes will be tracked and
mirrored by the Synthesis engine.
The EVOC 20 TO derives its synthesis signal from its monophonic tracking oscillator.
Alternatively to the tracking oscillator, the EVOC 20 TO can use a freely selectable audio
signal as the synthesis signal.
Note: For good pitch tracking, it is essential that the signal is monophonic (one pitch at
a time) and as dry as possible. Absolutely avoid background noises. As an example,
using a voice already processed with even a slight reverb will deliver pretty strange
results. The results will be even stranger when signals with no audible pitch are used—
such as drumloops. The resulting artefacts might, however, be exactly what you’re after
in some situations.
It should be noted that the EVOC 20 TO uses a Side Chain, allowing the use of another
track as the analysis and/or synthesis signal. In the gray area at the top of the Plug-in
window, click-hold on the Side Chain pull-down menu, and select the desired Audio
track. In the Mixer, adjust the volume levels of the EVOC 20 TO and the audio track used
for the Side Chain to taste.
The EVOC 20 TO is not limited to pitch tracking effects. It can vocode a signal by itself,
making it very useful for unusual filter effects. Try this with different Resonance, Formant
Shift and Formant Stretch settings.
As both analysis and synthesis input signals are freely selectable, you can even vocode
an orchestra with train noises, for example.
LFO 1 (Shift) LFO 1 Rate CC #93
LFO 1 Waveform Select CC #94
LFO 1 Intensity CC #95
LFO 2 (Fade) LFO 2 Rate CC #121
LFO 2 Waveform Select CC #122
LFO 2 Intensity CC #123
Output Level CC #124
Mono/Stereo Select CC #87
Stereo Width CC #86
Filter Bands Band Level Bank A Bank B